JLG 723A Service Manual - Manual (Page 35)

3-5 L2906H, 2906H, 3507H, 619A, 723A, 29.6LP, 29.6, 35.7
Boom
3.4.3 Second Section Boom Installation
1. Insert the extend/retract cylinder through the rear of
the second boom section and attach the pin and clip
to the rod end.
2. Install the bottom rear wear pads, washers and bolts
into the first boom section. Apply Loctite ® 243 TM and
torque to 90 Nm (66 lb-ft). Install the bottom rear left
and right side wear pads, backing plate and bolts (do
not shim or tighten bolts). Install top rear wear pads,
backing plates and bolts (front bolts are drilled and
tapped for zerk fittings, do not shim or tighten bolts).
3. Grease the inside of the first boom section on areas
where the second boom section wear pads will slide.
4. Using a suitable sling, carefully slide the second
boom section 1 m to 1.5 m (3 ft to 4 ft) into the front
of the first boom section. Set the second boom
section head onto suitable supports and reset sling
under the boom head of the second section.
Carefully slide the second section into the first
section. Leave 15 cm to 20 cm (6 in to 8 in) of the
second section out to be able to install wear pads in
front of the first boom section.
5. With the sling still under the boom head, install the
top wear pads, washers and bolts in the front of the
first boom section. Apply Loctite
® 243 TM and torque
to 90 Nm (66 lb-ft). Lower the second boom section
and install the bottom wear pads, backing plates,
shims and bolts in the front of the first boom section.
Apply Loctite
® 243 TM and torque to 90 Nm (66 lb-ft).
Install both left and right side front wear pads,
backing plates, shims and bolts in the front of the
first boom section. Apply Loctite
® 243 TM and torque
to 90 Nm (66 lb-ft).
Note: Light lubrication of the boom wear surfaces with a
factory authorized grease is recommended to keep the
boom wear surfaces lubricated properly.
6. Tighten all rear wear pad bolts after ensuring the
minimum gap requirements have been met. Refer to
Section 3.5.1, “Wear Pad Inspection.”
7. Insert the pin and clip into the barrel end of the
extend/retract cylinder.
8. Lift the tilt cylinder into place and insert the pins and
clips to secure the cylinder to the boomhead.
9. Slide the tilt and auxiliary hoses between the boom
sections.
10. Uncap and reconnect the tilt and auxiliary hoses and
attach to their appropriate locations.
11. Install the access cover on the front of the boom
head.
3.4.4 Boom Installation
Note: Light lubrication of the boom wear surfaces with a
factory authorized grease is recommended to keep the
boom wear surfaces lubricated properly. Light lubrication
of the boom wear surfaces is also recommended when
the machine is stored, to help prevent rusting.
1. Park the machine on a hard, level surface, place the
transmission control lever in (N) NEUTRAL, engage
the park brake and shut the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Using suitable slings, turn boom back over to original
orientation.
Note: Grease the boom pivot bore, compensating
cylinder rod ends, lift/lower cylinder rod end and pins
before installing.
5. Using suitable slings, balance the boom assembly,
lift and carefully guide the boom into place. Align the
frame pivot bore with the boom assembly pivot bore.
Install boom pivot pin (14) with keeper plate slot
facing down. Apply Loctite
® 243 TM to the mounting
bolts (15). Install the keeper plate (16), lock bolts
(15) and torque to 90 Nm (66 lb-ft).
MZ5630
15
14 15 16
MZ3640
2
1